LSGMC electrolyte

Fig. 6.17 Temperature dependence of cathodic overpotential of the Bao.6Lao.4Co03 cathode on the LSGMC electrolyte as a function of current density, reported by Ishihara et al. [204] (Reproduced with permission from Elsevier)...

The high conductivity of LSGMC makes it possible to fabricate self-supported cells and operate them at intermediate temperatures this in turn makes it easy to fabricate cathode and anode on the LSGMC electrolyte. A sealless stacking method is adopted electrochemical cells are stacked with metal interconnects using current collectors for cathode and anode sides. Because of this simple configuration and materials, their stack performance is similar to the sum of respective cell performance. In other words, loss in stacking is very small. 

On the other hand, it is expected that the power density of the cell increased with decreasing thickness of the electrolyte, since the main internal resistance is due to IR losses. Figure 4.21 shows the power density of an H2-O2 cell with 0.18-mm-thick LSGMC-8.5 electrolyte at 1073 and 873 K. As expected, the power density of the cell increases with decreasing the thickness of the LSGMC electrolyte. However, the open circuit potential exhibited a tendency... 

Bectrolyte BYSZ th = 140 um (Electrolyte substrate) 8YS2 lb 3 10Km LSGM/LSGMC /GDC/SDC etc. tb=7 15(im... 

Unlike the simple properties of the gas turbine, the efficiency of the SOFC-GT hybrid system does not grow here in linear fashion with increasing temperature, but has a maximum, depending on the type of electrolyte. In the case of electrolyte with the highest ionic conductivity (LSGMC), the optimum TIT is about 1050°C, which is close to the material ehosen for non-cooUng blades (950°C). 

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